!!! Multiple package instances within a single package slot have been pulled!!! into the dependency graph, resulting in a slot conflict:

dev-qt/qtgui:4

(dev-qt/qtgui-4.7.3::gentoo, installed) pulled in by (no parents that aren't satisfied by other packages in this slot)

(dev-qt/qtgui-4.8.5-r1::gentoo, ebuild scheduled for merge) pulled in by ~dev-qt/qtgui-4.8.5[aqua=,debug=,egl=,qt3support=] required by (dev-qt/qtopengl-4.8.5::gentoo, ebuild scheduled for merge) (and 6 more with the same problem)

dev-libs/libxml2:2

(dev-libs/libxml2-2.7.8-r1::gentoo, installed) pulled in by (no parents that aren't satisfied by other packages in this slot)

(dev-libs/libxml2-2.9.1-r1::gentoo, ebuild scheduled for merge) pulled in by dev-libs/libxml2:2[!icu?] required by (dev-qt/qtwebkit-4.8.5::gentoo, ebuild scheduled for merge)

It may be possible to solve this problem by using package.mask toprevent one of those packages from being selected. However, it is alsopossible that conflicting dependencies exist such that they areimpossible to satisfy simultaneously. If such a conflict exists inthe dependencies of two different packages, then those packages cannot be installed simultaneously. You may want to try a larger value ofthe --backtrack option, such as --backtrack=30, in order to see ifthat will solve this conflict automatically.

For more information, see MASKED PACKAGES section in the emerge manpage or refer to the Gentoo Handbook.

(dependency required by "media-video/vlc-2.1.2[gnutls]" [ebuild])(dependency required by "@preserved-rebuild" [argument])For more information, see the MASKED PACKAGES section in the emergeman page or refer to the Gentoo Handbook.